package com.star.service.impl;

import com.star.context.BaseContext;
import com.star.dto.ShoppingCartDTO;
import com.star.entity.Dish;
import com.star.entity.Setmeal;
import com.star.entity.ShoppingCart;
import com.star.mapper.DishMapper;
import com.star.mapper.SetmealMapper;
import com.star.mapper.ShoppingCartMapper;
import com.star.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
         //判断当前加入购物车的商品是否已存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);//拷贝数据
        Long userId = BaseContext.getCurrentId();//获取当前用户的id
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果存在，则数量+1.即number+1
        if(list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            //更新
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //如果不存在，则需要放入一条购物车数据

            //判断放入购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null) {
                //本次添加的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                //本次添加进购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();

                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            //插入购物车数据
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 减少菜品数量
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        // 创建购物车对象并复制数据
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        // 获取当前用户 ID
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        // 查询购物车中是否存在该商品
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            if (cart.getNumber() > 1) {
                // 数量大于 1，减少数量
                cart.setNumber(cart.getNumber() - 1);
                // 更新购物车
                shoppingCartMapper.updateNumberById(cart);
            } else {
                // 数量为 1，从购物车中删除该商品
                shoppingCartMapper.deleteById(cart.getId());
            }
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        //获取当前用户id
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    public void cleanShoppingCart() {
        //获取当前用户id
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }
}
